Question

Bond order of \(\mathrm{He}_{2}, \mathrm{He}_{2}^{+}\)and \(\mathrm{He}_{2}^{2+}\) are respectively:
(A) \(1, \frac{1}{2}, 0\)
(B) \(0, \frac{1}{2}, 1\)
(C) \(\frac{1}{2}, 1,0\)
(D) \(1,0, \frac{1}{2}\)

Answer 1

Ans: (B)
\(\operatorname{He}_{2}\left(4 \mathrm{e}^{-}\right)=\sigma(1 \mathrm{~s})^{2}, \sigma^{*}(1 \mathrm{~s})^{2} ; \quad B . O=\frac{2-2}{2}=0\) \(\mathrm{He}_{2}^{+}\left(3 \mathrm{e}^{-}\right)=\sigma(1 \mathrm{~s})^{2} \sigma^{*}(1 \mathrm{~s})^{1} ; \quad\) B.O \(=\frac{2-1}{2}=\frac{1}{2}\) \(\mathrm{He}_{2}^{+2}\left(2 \mathrm{e}^{-}\right)=\sigma(1 \mathrm{~s})^{2} ; \quad\) B.O. \(=\frac{2-0}{2}=1\)

Answer 2

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Answer 3

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